Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.69-3.816.50-7.00
1
7.18
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Fracture
Uneven, Conchoidal to uneven, ConchoidalWalter Schumann
Irregular, Conchoidal
Cleavage
Distinct on {110}, imperfect on {010}, poor on {001}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
8.53
2
10
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Chemical Composition
BeAl 2 O 4
PbMoO 4Walter Schumann , Gemstones of the world (2001)